I suspect if you took a poll of neutrals , by a strong majority they'd admit two things. Firstly getting this club under its present ownership and executive structure to finish consistently top of the league over the next few years (or to have hypothetically done so under similar circumstances in the last years) would be a substantial achievement, far outstripping doing the same for Man City post 2016. Secondly, there are question marks over Pep's greatness because the size of the challenges he'd had to face, given the player/structural resources available, were far less than other GOAT/all time top tier managers (SAF chiefly, but also the likes of Clough, Shankly, Busby, just in terms of the UK) had to.
SAF rebuilt numerous sides in different eras, competed in his last 10 years against at least one side that was consistently outspending his (and post 2009, two of them), having done so previously for Aberdeen against the Old Firm; dealing with various eras of player and changes to the league through managerial imports and approaches more radical than Pep has had to confront in a much more homogenized game which is more about small-details. There are also scandals hanging over Pep's greatest pre City achievements in terms of PEDs, which still haven't been reckoned with (in fact, largely whitewashed now), even before we get to City's shenanigans. And that's just for starters...
Honestly, there's case that without some dubious ''performance' enhancers and inheriting Messi., Xavi and Iniesta, just as they were coming into their primes, and then being allowed to go and rack up titles in a loaded dice of a Bundesliga, he'd never have gained the carte blanche and 'player authority' to do his experiments on an already absurdly talented, well-recruited squad borne aloft on virtually infinite resources (and underhanded, regulation evading payments). He's never had a structural challenge of the kind that defines truly epochal managers...